Phonograph disk



June 30, 1931. A A, PENTEADQ 1,812,550

PHONOGRAPH DISK Filed July 8, 1929 Eye 2 i 0 159m l le C /f m Jgr c tj t l 9' EN j g1 i y[a L /I f S c/ 'l Patented June 30, 1931 ARMANDO ALVARES' PENTEADO, 0F PARIS, FRANCE PHONOGRAPH DISK Application led ll'uly 8, 1929, Serial No. 376,698, and in France June 12, 1929.

The present invention has for an object the production of phonographic disks of extra light character' for use as directly recorded phonograms and destined particularly to be sent through the mail in an envelope as ordinary letters.

My improved disks are cut out of sheets or thin strips obtained by coagulating a cellulosic solution such as xanthogenate of cellulose viscose, or the like.

These blank disks are directly recorded on their tWo sides or on a single side, by dipping them in a liquid which does not dissolve them, such as Water, which is preferably hot, during a sufficient time in order that they become softened, some thirty seconds, for example, stretching the sheets by any suitable means, lastly vproceeding with the recording of the stretched sheets in any suitable manner, afterwhich the disks are alloWed to dry completely before being detached from their stretching supports.

This recording moreover as Well as the subsequent production of the disk may be brought about by utilizing an apparatus of the type Which forms the object 0f my prior French Patent N o. 573,131 of November 14,

The following description, when taken in 3G connection with the accompanying drawings, given by Way of example, will enable those skilled in the art readily to understand the invention- In said drawings, i

Fig. 1 is a plan view, partly in section, of the disk stretching apparatus;

Fig. 2 is a section on line 2-2 of Fig. 1;

Fig. 3 and Fig. et are sectional views on line 3 3 of Fig. 1 and illustrating the mounting of the disk in the stretching apparatus; c

Fig. 5 is asectional view on a larger scale illistrating how the. disk may be cut out; an

Fig. 6 illustrates the utilization of the recorded disk.

My extra light phenographic disk f ing the object of inyfinvention, v of a thin sheet of xanthogenate or t viscose, or the like, Whose property ol' facing firindirectly of phonetic Waves.

The thickness of the disk may be about 0.12 mm. Which thickness may vary in proportion to the diameter of the disk.

The disk thus softened is stretched by means of any suitable apparatus.

When the disk is in stretched position a hole is made in the center of the disk after which the disk is recorded on both sides.

When the recording is terminated and the disk is entirely dry, it is detached from its stretching support.

The recorded disk thus obtained can then be placed into an envelope and sent as a letter to its destination Where it may be utilized in all phonographs having a tone arm and a sound-box provided with a diaphragm which is not too heavy.

It is to be understood that modifications may be resorted to in connection with my process Without departing from the spirit of my invention as comprehended Within the scope of the appended claims.

Having described my invention What I claim as new and desire to secure by Letters Patent is:

1. As a new article of manufacture a recorded phonographic disk consisting of a thin flexible sheet of xantliogenate of cellulose, provided With an indented spiral groove.

2. As a new article of manufacture, a recorded phonographic disk consisting of a thin flexible sheet of xanthogenate of cellulose, provided tvith an indented spiral groove directly traced on its surface.

if recording ultra light phoof xanthogenate of cellulose Whicli comprises .softening the disk by dipping'thc saine ii' dissolve it, strctciiii frame, directly r fram-e While in a .s

liquid which does not the softened d1sk in a n ording ultra light phoel tanthogenatc of cellusse which ,-nipri;-.y

ieft-.ning the disk by dipping the same water, stretching the,

softened disk in a, frame, and directly rel cording the disk in the framewhile in a soft state.

5. A process of recording ultraJ light phonographic disks of Xanthogenate of cellulose Which comprises softening the disk by dipping the saine in Water, stretching the softened disk in a frame, directly recording the disk in the fra-me While in a soft state and letting the disk dry in the frame.

.In testimony whereof I have signed this specification.

ARMANDO ALVARES PENTEADO. 

